1. Chapter 26 Review Applied Physics

2. Vocabulary Your vocabulary assessment will consist of matching words and definitions. Your vocabulary assessment will consist of matching words and definitions. Please study the vocabulary from your packet. Please study the vocabulary from your packet. Beats Beats Compression Compression Forced Vibration Forced Vibration Infrasonic Infrasonic Natural Frequency Natural Frequency Pitch Pitch Rarefaction Rarefaction Resonance Resonance Ultrasonic Ultrasonic

3. Concepts (Basic Sound) Sound forms ______________ waves. Sound forms ______________ waves. Sound originates from _____________. Sound originates from _____________. Sound waves require _____________ in order to travel. Sound waves require _____________ in order to travel. Sound travels better in ___________ and __________ Sound travels better in ___________ and __________ Know the parts of a sound wave. Know the parts of a sound wave.

4. Concepts (Interference) Two Sound waves can _____________ with each other. Two Sound waves can _____________ with each other. ____________ interference occurs when sounds amplify each other. ____________ interference occurs when sounds amplify each other. ____________ interference occurs when sounds deaden each other. ____________ interference occurs when sounds deaden each other. ____________ occurs when sounds periodically get louder and softer. ____________ occurs when sounds periodically get louder and softer.

5. Concepts (Interference) Identify either constructive or destructive interference as a result. Identify either constructive or destructive interference as a result.

6. Concepts (Interference) Most objects have a frequency in which they vibrate with minimal energy loss. This is called the ___________ frequency. Most objects have a frequency in which they vibrate with minimal energy loss. This is called the ___________ frequency. An object driven at this frequency will experience an ___________ in sound. An object driven at this frequency will experience an ___________ in sound. The phenomenon mentioned above is called __________. The phenomenon mentioned above is called __________.

7. Concepts (Frequencies) ____________ directly relates to the frequency of sound. ____________ directly relates to the frequency of sound. Humans can hear frequencies between _______ and _______ Hz. Humans can hear frequencies between _______ and _______ Hz. Sounds below that threshold are called ___________. Sounds below that threshold are called ___________. Sounds above that threshold are called ___________. Sounds above that threshold are called ___________.

8. Concepts (Sound Intensity) __________ is our impression of the intensity of sound. __________ is our impression of the intensity of sound. Scientists use the __________ (dB) scale to measure intensity level. Scientists use the __________ (dB) scale to measure intensity level. The scale is different because an increase of 10dB from any point is actually a multiplication by ____ The scale is different because an increase of 10dB from any point is actually a multiplication by ____ How many times louder is 50dB than 20dB? How many times louder is 50dB than 20dB?

9. Concepts (Sound Speed) The speed of sound in air at room temp is ______ m/s, as opposed to ____ m/s at 0°C. The speed of sound in air at room temp is ______ m/s, as opposed to ____ m/s at 0°C. Speed of sound is affected by __________ and ___________, not __________ and ___________. Speed of sound is affected by __________ and ___________, not __________ and ___________. Sound travels ____ times faster in water and ____ times faster in steel. Sound travels ____ times faster in water and ____ times faster in steel.

10. Sound Problems You will need to know how to use the following equations: You will need to know how to use the following equations: Recall: the quantities are as follows: Recall: the quantities are as follows: Speed (variable ____ and units ____) Speed (variable ____ and units ____) Frequency (variable ____ and units ____) Frequency (variable ____ and units ____) Wavelength (variable ____ and units ____) Wavelength (variable ____ and units ____) Note: Temperature is not in the equations. Note: Temperature is not in the equations.

11. Sound Problems The frequency of beats between two closely matched sounds can be found with the following equation: The frequency of beats between two closely matched sounds can be found with the following equation: If the sounds differ in frequency too much, the beats will be inaudible. If the sounds differ in frequency too much, the beats will be inaudible. If the sounds are identical in frequency, there will be ____ beat frequency. If the sounds are identical in frequency, there will be ____ beat frequency.

12. Bonus Section May consist of factual information mentioned in class that is beyond what you are required to know. May consist of factual information mentioned in class that is beyond what you are required to know. May consist of insights from the lab that you conducted on the speed of sound. May consist of insights from the lab that you conducted on the speed of sound.